Coatings for driveways vary greatly, materials used is one factor. You will also have to consider if any preparation works will need to take place (removal of old driveway, drainage, waste)
Cheap option, over lay with stone
Expensive option, tarmac or resin bonding
At your measurements 260m2 this would mean if you are to budget an average drive with average work (digging waste etc....) you could expect the cost to be over Â£20,000 plus vat.
A full site survey and a customer focused plan would need to be confirmed before any real costing could be put in place.